Richard Rodgers and Lorenz Hart wrote this show with Gene Kelly in mind.
He was not an unknown entity at the time. Remember back then how incredibly important Broadway was to the American entertainment industry.
A kid with Kelly's talents would have been recognized years before by the Broadway equivalent of baseball scouts. He had appeared in two shows on Broadway and had choreographed numbers for several shows.
Robert Alton had been a hoofer himself, all the way back to the early 1920s and knew every talented kid in the biz. All of this by way of saying R&H(version 1) knew who they were getting and crafted a show around him.
This is a dancer's show. This was Gene Kelly's show. If Christian Hoff has the balls to say he has talents equal to the guy this show was written for, then I'll pay to see him. If he says "I have other talents" I'll say "So has Paulo Szot, but I wouldn't pay to see him in Pal Joey."
Harold Lang and Bob Friggin' Fossee have played this role. I smell dancer, not singer who moves.
Finally, to prove my point, watch this footage again and tell me that Christian Hoff has the talents Gene Kelly had (and also see how Gene was dancing in 1933. As A KID he was amazing).
http://www.youtube.com/watch?v=AsvDiqzSUBQ
http://www.broadwayworld.com/board/readmessage.cfm?thread=972787#3631451
http://www.broadwayworld.com/board/readmessage.cfm?thread=963561#3533883
http://www.broadwayworld.com/board/readmessage.cfm?thread=955158#3440952
http://www.broadwayworld.com/board/readmessage.cfm?thread=954269#3427915
http://www.broadwayworld.com/board/readmessage.cfm?thread=955012#3441622
http://www.broadwayworld.com/board/readmessage.cfm?thread=954344#3428699